Africans Countries And Poverty Part One

Africa is known to be a black community with the population of 1,125,307,147 people with different tribes, cultural background, languages and religions.
Poverty is the quality or state of being poor or indigent; want or scarcity of means of subsistence; indigence; need.
Why poverty so common and a major problem in Africa ? With the population above 1billion, africa is known to be the poorest continent in the world with the Seventy-five percent of the world poorest countries in the world. Another fact shows that, in 2012, 501 millions or 47 percent of people in sahara africa lived on $1.90 or below.
Daily post News paper reported that Nigeria the most populous Nation in Africa continent is the 3rd poorest continent in thé world due to the fact that 64% of below poverty line.
Business Insider UK reported that out of 30 most poorest countries, African countries has 23 countries among them.
What is the problem of African Nations ?